Johan m



(No Model.)

J. MLANDERSEN. FRICTION OLUTOH PULLEY.

INVENTEIR Patented June 10, 1890.

:2 I I 176W 2!. CZ-raZerSem UNITED STATES PATENT OFFICE.

J OHAN M. ANDERSEN, OF BOSTON, MASSACHUSETTS, ASSIGNOR OF ONE-HALF TO ALBERT ANDERSON, OF SAME PLACE.

FRICTION-CLUTCH PU LLEY.

SPECIFICATION forming part of Letters Patent No. 430,053, dated June 10, 1890. Application filed January 14, 1890. Serial No. 336.905. (No model.)

To all whom it may concern.-

Be it known that I, J OHAN M. ANDERSEN, a subject of the King of Norway, but at present residing at Boston, county of Suffolk, State of Massachusetts, have invented an Improvement in Friction-Clutch Pulleys, of which the following description,in connection with the accompanying drawings,is a specification, like letters and figures on the drawings IO representing like parts. This invention has for its object to construct a friction-clutch pulley the parts of which may be quickly and easily operated when to be engaged, and hold with great force. I 5 In accordance with this invention a pulley is mounted loosely on the shaft to be driven, and is prevented from moving thereon-longitudinally by suitable means. A suitable hub fastened to the shaft carries a split rin g, herein shown as having two spring-like semicircular arms. When the arms composing the ring are in their normal position they are substantially free from contact from the inner surface or perimeter of the loose pulley. 2 5 Suitable means are provided for spreading the said spring-like arms to firmly engage the inner surface of the rim of the said pulley to rotate it by frictional contact.

Figure 1. shows in longitudinal section a friction-clutch pulley embodying this invention; Fig. 2, an end view of the pulley shown in Fig. 1; and Figs. 3, 4, and 5, details of the means employed for spreading the arms of the split ring to engage the loose pulley. 5 The shaft a has loosely mounted on it a pulley a. A collar a is' secured to the shaft a, at one side of the pulley a, to prevent longitudinal movement of the loose pulley on the shaft. A hub b is secured to the shaft a at 40 the other side of the loose pulley a, it having formed integral with it or fastened to it a split ring, shown as two spring-acting semicircular arms 0 0'. These semicircular arms normally lie substantially free from contact with the inner surface of the rim of the loose pulley a. Two ears 2 2 are formed on the hub 1), between which are pivoted an arm d, extended parallel to the shaft a, and moving between two guide-ears 3 3, also formed on the hub 11. An adjusting-screw e, passed through the arm (Z, limits its inward movement. The arm (1 at its outer end has secured to it a thin spring-plate e, against the inner side of which bears an adjusting-screw o The plate 6 at the outer end of "the arm d is curved, as shown, so as to be acted upon gradually by a sliding cone f, loose on the shaft to, and made movable longitudinally by means of a lever f. As the cone is moved back and forth the arm (Z will be raised and lowered. A block at is loosely connected to the arm d at a point between the ears 2 and 3 by means of apin 4 or otherwise. This block at has a tongue 97. at its outer end, which moves in guideways formed between the ends of the spring-like semicircular arms 0 0. (See dotted lines, Fig. 2.) The block at at each side has a socket, as 01. which receives a ball or roll, as 11 on a toggle-bar at, there being, therefore, two toggle-bars. formed on the opposite end of each toggle-bar W, said balls or rolls entering sockets formed in the spring-like semicircular arms at a point near their free ends, (see Fig. 2,) thereby constituting two toggle-levers with ball-andsocket joints, by which the said arms 0 0 may be spread. The balls or rolls a of the toggle-bars n have projections 0, which enter slots 0', formed in the blocks a, leading from the sockets 01 the projections serving as stops for the toggle-bars to keep them in place. As previously stated, the arms 0 c normally lie substantially free from contact with the inner surface of the rim of the pulley a, but by moving the block fin the direc- 8 5 tion of the arrow therein the arm 61 is lifted, and the block at rising moves the toggle-bars n and forces the said arms 0 c apart and into contact with the inner surface of the rim of the pulley with such force as to cause the hub and shaft to rotate with the pulley without slipping of the devices employed. The movement to force the arms against the moving pulley is very short. and can be accomplished rapidly, and the engaging means herein shownviz., the arms 0 care strong and will withstand great strain, and when the arms are engaged with the pulley the engagement is with great force.

To prevent the expansion of the arms 0 c,

A ball or roll is 70' due to centrifugal force, I have provided a spring 42, it being shown as secured to the ears 3 3, the end of the spring bearing on the arm (Z at or near the pivot 4.

The block a and bars or constitute one form of means for expanding the arms 0 0; but it is obvious that the said arms may be expanded by other equivalent well-known devices; so this invention is not limited to the exact form of expanding device. The springlike arms start from the hub, and are curved away from each other before they reach the pulley, such shape enabling the arms to be easily expanded, and reducing the liability of the arms breaking when expanded.

I claim 1. In afriction-clutch pulley, a loose pulley combined with a fixed hub having a split ring composed of two spring-like semicircular arms, and provided with guideways in their ends, the block it, provided with a tongue adapted to enter said guideways, toggle-bars n moved by the block, and the pivoted arm (Z for moving said block n, and pivotally connected therewith, substantially as described.

2. In a friction-clutch pulley, a loose pullcy combined with a fixed hub having ears 2 3, and a split ring composed of two springlike semicircular arms having guideways in their ends, a block or, having a tongue to slide in said guideways, toggle-bars moved by it, a

lever (Z, pivoted between the ears 2 and also pivotally attached to the block it, said lever adapted to be acted on by a cone to move said toggle-bars, and a spring 42, attached to the ears 3 and bearing upon the lever (t, as and for the purposes described.

In a friction-clutch pulley, a loose pulley combined with a fixed hub having a split ring composed of two spring-like semicircular arms, the toggle-bars, and the pivoted arm (I, having the adjusting-screw 0, substantially as described.

4. In a friction-clutch pulley, a loose pulley combined with a fixed hub having a split ring composed of two spring-like semicircular arms, the toggle-bars, and the pivoted arm (I, having the plate 6, and the adjustingscrew e substantially as described.

5. In a friction-clutch pulley, a loose pulley combined with a fixed hub having a split ring composed of two spring-like semlcircular arms, the block it, and toggle-bars n connected by ball-and-socket joints and having the stop 0 0', substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JAS. I'I. CHURCHILL, FREDERICK L. EMERY. 

